Question

Image text transcribed for accessibility:A circular conducting rubber loop expands at a constant radial velocity u=uor in a region permeated by a uniform magnetic field that is perpendicular to the loop and varies in time as B=B0taz. The radius of the loop at any lime t is rt=u0t. Neglect the thickness of the conducting rubber wire. Draw a representation of the problem. Find the induced emf. How does the result change if the magnetic field is oriented in the -z direction?